I wonder how far back Listens-to-Wind goes back?

Jim has hinted at LTW and Ebenezer meeting around the time of the French and Indian Wars, so at least that long.

Here's the way I, as a GM handle it- specifically with Listens-to-Wind's relative ease of shifting in mind (which clearly wasn't accounted for in the rules-as-written.)

The complexity of the spell is equal to (Total Refresh Cost of Powers Gained x2) +2.  It's simple, and while it may make shapeshifting too easy for some GMs' tastes, I found the alternatives basically unacceptable.

I've developed a very unique feeding system for the Jade Court in my game that is a lot different from any of the current vampires... though I guess it's closest to White out of the three of them.  It's also a pretty huge spoiler and I know my players get on here sometimes, so if you want me to share it with you shoot me a PM.

Yeah, I'm aware.  I just happen to be very interested in myths from a very specific region in a very specific time period.  I know that they ultimately came from older myths from other regions.  Heck, there's good evidence that Odin and Hermes/Mercury- who couldn't be less alike on the surface- were evolutions of the same Proto-Indo-European god.  I just choose to study a very small sliver of the expansive geographical and chronological scope of mythology.

other Svartalfar such as goblins, trolls, and the like, had problems with sunlight instead

As far as I know, actually, trolls are usually lumped in with jotun-kind.  (The ugliest among them, as they are usually described.)  And I've personally never heard mention of the term "goblin" in any Norse saga.

One of my players is big on norse mythology and his Wizard is very much centered on that theme but Norse is one area of lore that Im quite ignorant of. This thread has already been very informative! Is there any reccomended sources of reading?

Snorri Sturlusson's "Prose Edda" is essentially "The Beginner's Guide to Norse Lore."  Depending on the translation, it's also not terribly difficult to understand.  I use the Jesse L. Byock translation, which is more plain English than some of the other ones.

If you want more in-depth from there, you can check out the Poetic Edda.  It's much longer and much more difficult to understand without context.  I'd go with the Carroline Larrington translation for a beginner, but I ultimately much prefer the Lee M. Hollander one- he tries to preserve the poetic flow of the pieces, whereas Larrington just translates the lines dryly to try to make them understandable to English speakers.
There are probably half a dozen other translations, but those are the two I can vouch for.

If you still want more after that, "Saga of the Volsungs" is definitely the next one to check out.  It's the story of Sigurd the Dragon Slayer.  In Germany it is known as the Nibelungenleid and was the inspiration for Richard Wagner's Ring Cycle.

Beyond those three, there are dozens of Icelandic sagas worth a read.  Njal's Saga and Egil's Saga are two of my favorites.

Deadmanwalking- Svartalfar actually are dwarves, and don't let White Wolf tell you any different.   

I don't think anything he's said so far is a spoiler, but I can see your point.

I am an avid scholar of Norse mythology- it occupies a significant portion of my life, and I'm glad to help.  However, up until now it just seems like you're just posting information and I'm not sure what, if anything, you need help with.

A note on Svartalfr- there's a bit of a lore debate still going on with these guys.  It's pretty clear at this point that "Svartalf" refers to the dwarves, but there are some who believe there is a separate race supported in the sagas of "Dokkralfr," true "dark elves" that are counterparts to the Alfar.  They would have their own realm, explaining why there are attested to be Nine Worlds, and yet most sources (including your post) only name eight.  As for what the Dokkralfr would look like... there really isn't anything in the lore describing them, so I guess it would be up to the GM to fill in those gaps.

Also, about your discussion of giants.  In Old Norse, -jur (pronounced "yoor," just as a note to anyone reading) is just a suffix that takes a male noun and makes it female.  So you could add -jur to the end of any of the jotun tribes to describe a female of that race and, probably, remove it to describe a male of the gygjur or ividjur.

For example, a female of the Aesir is called an Asynjur, and a female of the Vanir is called a Vanjur.
Reversing that rule with Gygjur and Ividjur to get the male counterparts, we'd have Gygir and Ividir.
That's more of a linguistics answer than a lore-supported answer, but for a roleplaying game I'd say it's close enough. 

Physical Adepts in Shadowrun have their powers on all the time, and no magical powers aside from the physical enhancement, so they'd just buy powers.

Ah, okay.  I fail for not knowing much about the setting he's trying to replicate.  >_<